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thurso high school
Technology Technology Department Department
Gra
phic
G
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C
om
munic
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Com
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Graphs and Charts
GraphsA GRAPH (or Line Graph) connects a series of plotted points. The graph depicts trends or movement over a period of time.
WHEN TO USE:To show trends or movements rather than amountsTo Illustrate long series of dataTo compare series of dataTo predict trends or movement
WHEN NOT TO USE:
When the emphasis is on amountsWhen relative size or difference is required
Enhancing GraphsLo
tus
MG
Dod
ge
BM
W
Ast
on M
artin
Jagu
ar
Votes02468
10
Favourite Cars
Sm
artie
s
Ski
ttle
s
Fru
it P
astil
s
Pol
o
Sta
rbur
st
Rol
o
Mar
sbar
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12
42 3 3
02468
1012
No. of people who chose sweet
S1
0
5
10
15
20
Favourites
(%)
Drinks
Types
Fi zzy Dr i nks
7
6
5
4
3
2
1
0
Number
of
Pupils
M o n t h
T h is is aline g raphshow ing theb irthday m onthso f 50 R obertG ordon 's C o llegepup ils .
BAR CHARTSA BAR CHART compares qualities or values which are not time related.
WHEN TO USE:To compare the magnitude or size.
To illustrate trends or movement
WHEN NOT TO USE:
Physical qualities such as size or weight work best vertically.
Comparison of the magnitude of a number of items work best horizontally.
Enhancing Bar Charts
0 5 10 15 20 25No. of People
0
5
10
15
20
Favourite Flavour Of Crisps
Ready salted
Salt&vinegar
Cheese&onion
Pickled onion
Prawn cocktail
PIE CHARTSA PIE CHART is used to show relative values as a whole
WHEN TO USE:To show approximate relative values of component parts of a whole.
To compare component parts
WHEN NOT TO USE:
Charts with 7 or more components are usually confusing and difficult to interpret
To show large numbers of components in a part.When the values of a number of component parts are small
Enhancing Pie Charts
Favourite Sport
Swimming
Football
Rugby
Hockey
Athletics
Cricket
PICTOGRAMPictograms may be considered a type of BAR graph
WHEN TO USE:
When items by be represented by symbols or pictures.
WHEN NOT TO USE:
Values or sizes are represented by symbols or pictures directly related to the information being conveyed.
When symbols or pictures are unclear or obscure.
0
4
8
12
16
20
Numberfor favouritedrink
DrinktypeCoke
Enhancing Pictograms
PowerPoint Presentation. 2003
